Please help me i’ll do whatever i’ve asked this question twice but no ones answered please help

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?